<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
<body>
hello world!
<h2>数学计算</h2>
<form action="MathServlet">
    <input name="a">
    <select name="op">
        <option value="+">+</option>
        <option value="-">-</option>
        <option value="*">*</option>
        <option value="/">/</option>
    </select>
    <input name="b"> <button> = </button>
</form>

<h2>选择项</h2>
<form action="YouItemServlet" method="post">
    你的学历：<input type="radio" name="edu" value="初中">初中
            <input type="radio" name="edu" value="高中">高中
            <input type="radio" name="edu" value="大专">大专
            <input type="radio" name="edu" value="本科">本科
            <br />
    你的爱好：<input type="checkbox" name="likes" value="电影">电影
            <input type="checkbox" name="likes" value="篮球">篮球
            <input type="checkbox" name="likes" value="空洞骑士">空洞骑士
            <input type="checkbox" name="likes" value="扶老奶奶过街">扶老奶奶过街
            <br />
    <button>提交</button>
</form>

<h1>文件上传（表单方式）</h1>
<form action="upload.s" method="post" enctype="multipart/form-data">
    <input type="file" name="myfile">
    <button>上传</button>
</form>

<h1>同名验证</h1>
<a href="ajax/同名验证.html">同名验证</a>

<h1>验证码</h1>
<a href="验证码.html">验证码</a><br>
<a href="在线人数统计.html">在线人数统计</a>
</body>
</html>